Abstract
It is well known that formulae exist for estimating missing observations in ANOVA. These formulae are derived by minimizing the residual sum of squares. The formulae apply to situations where there is a single missing observation. If there are two missing observations, the recommended procedure is to guess one of them, use the appropriate formula to estimate the other, then use the formula again to estimate the first, continuing iteratively until convergent estimates for the two missing observations are reached. The purpose of this note is to show that explicit formulae can be found for the two missing observations, which can therefore be calculated directly without the need for an iterative procedure.
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